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400 + 400 + 400 + 400 = 1600
b. kalau seri, konstantanya 1/ k1 + 1/k2 + 1/kn
1/400 + 1/400 + 1/400 + 1/400 = 4/400 = 1/100
k = 100
kalau yang c, (1/300) x 4 = 4/300... 1
(1/300) x 2 = 2/300......2
300......3
4/300 + 2/300 + 300 = 350